Gas burner with air and flame baffles



July 17, 1951 R. D. REED 2,560,888

GAS BURNER WITH AIR AND FLAME BAFFLES Filed Nov. 8, 1946 3 Sheets-Sheet l Zhwentor 34 a 25 ROBERT D. REED,

L attorneys July E7, 1951 R. D. REED 2,560,888

GAS BURNER WITH AIR AND FLAME BAFFLES Filed Nov. 8, 1946 3 Sheets-Sheet 2 FIG 2 zmzew l Lg &\

Snuentor ROBERT D. REED,

July 17, 1951 R. D. REED GAS BURNER wrm AIR AND FLAME BAFFLES 3 Sheets-Sheet 5 Filed Nov. 8, 1946 Bnventor ROBERT D. REED,

1/ Gttorueg Patented July 17, 1951 UNITED STATES PATENT OFFICE GAS BURNER WITH AIR AND FLAME BAFFLES Application November 8, 1946, Serial No. 708,769

2 Claims.

This invention relates to gas-fired furnaces. and especially to pre-mix gas burners for such furnaces.

One of the objects of the invention is to provide gas burning equipment comprising identical units which may be assembled to constitute a gas burner arrangement of any desired capacity.

Another object is to supply a gas burner unit constructed for use with standard fire brick, adapted to be heated by the flame, to provide an additional source of radiant heat, to increase transfer of heat in a boiler furnace, and thus better serve efliciency.

A further object is to provide a burner of this character with which a broken or chipped brick may be used.

Other objects of the invention is the production of an eficient gas burner, which is of the utmost simplicity of construction, can be manufactured at relatively low cost, and provides for ease of assembly of the parts within a furnace.

Other objects will appear and be more fully pointed out in the following specification and claims.

In the accompanying drawings:

Fig. 1 is a fragmentary front elevation, partly in transverse vertical section, of a boiler furnace showing one of my units installed therein.

Fig. 2 is a longitudinal vertical sectional view on the line 2-2 of 1.

Fig. 3 is a horizontal sectional view taken the line 3-3 of Fig. 2.

Fig. 4 is a sectional perspective view of the upper portion of a couple of the units.

Fig. 5 is a vertical sectional view of one of the gas burner units.

Referring to the drawings, 5 designates a furnace such as a boiler furnace having a bottom chamber 6 arranged below a combustion chamber I. A doorway 8 for the lower chamber is provided at the front of the furnace, and it is closed by a counter-balanced door 9, pivotally mounted at ll, for rotation about a horizontal axis.

A gas supply pipe ll extends through the front wall of the furnace and supplies gas to manifolds l2, arranged side by side longitudinally of the lower chamber and supported on the floor l3 thereof by suitable brackets or supporting member ll. Each manifold is provided at the top thereof with a series of spaced spuds l5 which project from the manifold so as to discharge gas into the units 16. Each unit, as best shown in Fig. 5, consists of a mixing tube H having a flared mouth I! at its lower end for the reception of primary air. The lower end of each unit is provided at diametrically opposite sides with legs I! connected together by a horizontal bridge 20, provided with a vertical aperture 2| for the reception of the spud 15. Due to this construction, each unit will be supported in vertical position by the spud with which it is associated, while resting on the manifold. Obviously, the spud will direct fuel gas into the mixing tube, and the gas will induce primary air to flow upwardly through such tube into a plenum chamber 22 formed within the-head of the unit. Such head flares from the mixing tube and merges with an angular wall 23 supporting a plate 25 which provides a closed roof for the chamber 22, preferably provided with a rec an ular cavity or recess 26 (Fig. 4), designed to receive the bottom portion of a fire brick 21.

A rectangular horizontal rim 28 is integral with and surrounds the wall 23, and it is provided at its sides and ends with spaced projecting lugs 29 designed to abut against complementary lugs of adjacent units so as to provide secondary air slots 30, placing the lower chamber 6 in communication with the combustion chamber 1. The recess 26 is preferably formed by a rectangular mound 3|, and spaced vertical perforations 32 extend through the roof 25 and the mound for directing jets of gas along the vertical surfaces of the fire brick 21 when the latter are used.

The mound 3! has an outer sloping surface 33, and perforations 34 extend through said surface from the plenum chamber 22 so as to direct jets of gas upwardly and outwardly away from the fire brick and toward the air travelling upwardly through the slots 30, as will be clear from Fig. 4.

A pilot gas pipe 35 extends through the front wall of the furnace and terminates in a pilot burner 36, projecting through one of the slots 30 in a position to ignite one or more of the gas burner units.

From the foregoing, it will be understood that the gas spuds l5 direct streams of fuel gas up the mixing tubes to produce an air-gas mixture which is delivered into the plenum chamber at the discharge end of each mixing tube. The airgas mixture is then discharged through the ports 32 and 34 drilled, as shown in Fig. 4. Some of the ports are so disposed as to direct the airgas mixture parallel to the side faces of the fire brick 21 while the other ports are so disposed as to project the air-gas mixture at angles of 30 or degrees, or both, from the side faces of the brick of that unit. Thus the air-gas mixture streams are separated to permit ready aeration by the secondary air which is passed through the slots 38. While this is going on, the rims 28 and their lugs 29 maintain the spacing of the units and serve the purpose of maintaining ignition on the streams of air-gas mixture emerging from the ports.

The slots 30 create a slight pressure drop between the point of air supply and the point of air mixture to assure even distribution of secondary air for burning.

The bricks 21 are set on the tops of the units to provide refractory directly in the flame and this refractory provides an additional source of radiant heat to increase transfer of heat within the furnace.

It will be noted that the top of the unit is completely closed except at the edge portions thereof, so that gas does not flow through slots around the brick, as has been customary heretofore. As the brick does not form any portion of the orifice, the burner may be operated entirely satisfactorily without the brick, if it is required to do so. Furthermore, my design is such that broken or chipped brick may be used. Those versed in the art are familiar with the fact that broken brick cannot be employed on the burners heretofore known, because cracks or irregularities in the bricks permit flash-back into the plenums.

While I have disclosed what I now consider to be a preferred embodiment of the invention in such manner that the same may be readily understood by those skilled in the art. I am aware that changes may be made in the details disclosed, without departing from the spirit of the invention, as expressed in the following claims.

What I claim and desire to secure by Letters Patent is:

1. In a gas burner unit, means providing a plenum chamber for an air gas mixture, said means including a horizontally disposed solid plate having an under surface closing the top of said chamber and having an upper surface defining the top of the burner, said plate having a recess in the upper surface for receiving a refractory body shaped in horizontal cross section to fit into and be positioned by said recess,

said plate having a series of substantially ver' tical ports extending therethrough from the plenum chamber and arranged around the perimeter of said recess, said plate having another series of ports therethrough extending upwardly and outwardly from the plenum chamber and arranged around the perimeter of said recess and around and outwardly of said first series of ports, and a horizontally disposed rim projecting outwardly from said means around the perimeter thereof below said second series of ports.

2. In a gas burner unit, angularly arranged walls providing a plenum chamber for receiving a mixture of gas and air, said walls including a horizontally disposed solid plate having an under surface closing the top of said "plenum chamber and having an upper surface defining the top of the burner, said plate having a polygonal shaped cavity in the upper surface thereof, said plate having a series of substantially vertical ports extending therethrough from said plenum chamberat spaced intervals around the perimeter of said cavity, said plate having another series of ports extending therethrough from said plenum chamber with the axes of the second ports disposed outwardly at an angle with respect to the axes of the first ports and arranged at spaced intervals aroundthe perimeter of said cavity. and a rim projecting outwardly from said walls and having a horizontally disposed upper surface immediately below outlets of said second series of ports.

ROBERT D. REED.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 313,834 Noel Mar. 10, 1885 991,197 Chadborn May 2, 1911 1,808,319 Roberts a- June 2, 1931 1,886,866 Blakesley Nov. 8, 1932 2,081,657 Balthis May 25, 1937 2,367,143 Schrader Jan. 9, 1945 

